I bought a bunch of bananas on April 6, and I put half of them in the DMGB and left half out on the counter. I ate all but one from each group, and, in the name of research, I let the remaining two languish well beyond all food safety recommendations. After 12 days, here are the results:
As you can see, the top banana did not go quite as brown, but there are some mold issues. To be fair though, the DMGB instructions do say that if any moisture builds up inside the bag, you should wipe it out with a paper towel. I did this for a few days but then got lazy and didn't. So, that's probably my fault. Also, it should be noted, that when I first separated the bananas, the ones in the bag were actually a bit more brown than the ones that I didn't put in the bag, even though they came from the same bunch.
Conclusion: Overall, I would say the Debbie MeyerTM GreenBags® do make a difference. Obviously, I think the recommendation about keeping the bag dry is one that needs to be heeded. Also, if you go through produce in a reasonable amount of time, this product probably would not provide much benefit, but if you buy in bulk or are just slow consumers of produce, like me, this might be a helpful way to save some money.
I have some baby spinach in the fridge that I also separated around the same time as the bananas. I put half in a DMGB, half in the bag that it came in (which I resealed with my FoodSaver®-very handy!). So far, there doesn't seem to be a noticeable difference between the two bags, but I will let you know if anything changes.
Disclaimer: I have not received anything in exchange for this review. I'm just sharing information. The product links above are to Amazon.com. I am an Amazon Associate, so if you decide to purchase any products through my link, I will receive a small referral fee. The FoodSaver® device that I linked to is the model that we own, and as far as I can tell, it is no longer available on the FoodSaver® site.